Sphinctrina tubiformis A. Massal
Calicium tubaeformis (A. Massal.) R. L. Seym.
Thallus absent. Limited to globose and stalked apothecia growing on Pertusaria leioplaca and Pertusaria pseudocorallina, and in our region near the seashore on Pertusaria pseudocorallina. Apothecia sometimes in tufts, 0.15-0.4 mm tall, with a globose head, of the same diameter (stalk height = head diam.), dark brown to black. Ascospores broadly ellipsoid, apices pointed, minutely ribbed or wrinkled in length, 12-15 x 7-9 µm. Quite common, on Pertusaria pseudocorallina where it acts as a commensal more or less pathogen. Frequently confused, mainly at first when the apothecia are not yet black, with isidia of Pertusaria pseudocorallina that have a strong development, but the tufted aspect implies that a more detailed observation should be done.*